UHE is a Service available in Watch_Dogs.
It can be download freely on App Store, its mostly used to hack other Services, like CtOS.Aiden Pearce uses it during the game, to see Goverment Secrets, Steal Music, Steal Money...etc. It connects to the mainland SekDec system. Which is different from the other hacking devices. Its main hacking device is though..SymCha. It's different from the other Headquarters, their Headquarters are in one island near Mainland Chicago.